I would ask the people over at Fedora Lounge's outerwear forum. They have a "interest" (some would say unhealthy obsession) in aviator jackets. You will probably learn more than you have ever wanted...
http://www.thefedoralounge.com/forumdisplay.php?f=4

Hello everybody,
Yesterday was a lovely day here in Stockholm, slightly cold but crisp, clear skies and even some of that ever-illusive sunlight. Nice dry streets. At least I thought so while deciding what to wear for the day. Later that evening I walked out into a wet snowstorm and rapidly melting slush covered sidewalks. Needless to say, my leather soles were not pleased.
As I walked, cursing, through the horrible goo I reflected on how much better I would feel...